.header{
    width: 100%;
    height: 44px;
    line-height: 44px;
    color: #000;;
    font-size: 16px;
    text-align: center;
   
}
.content{
    background-image: url("../img/advertisement-bg.jpg");
    background-repeat: no-repeat;
    background-position: center top;
    background-size: 1000px;
}
.count-down{
    position: fixed;
    top: 72px;
    right: 10px;
    width: 100px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    border-radius: 20px;
    background-color: #fff;
}
.slogan{
    opacity: 0;
    position: fixed;
    bottom: 200px;
    width: 100%;
    text-align: center;
    font-size: 40px;
    color: #fff;
    animation: feaeDown 2s linear forwards;
}
//执行动画
@keyframes feaeDown{
    0%{
        opacity:  scale(0.2);
    }
    50%{
        opacity: scale(0.5);
    }
    100%{
        opacity:1;
        bottom: 100px;
        transform: scale(1.2);
    }
}